﻿248 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  Above 
  the 
  shales 
  of 
  C 
  1 
  the 
  slope 
  is 
  partly 
  covered, 
  but 
  there 
  

   are 
  occasional 
  ledges 
  of 
  thin 
  bedded, 
  bluish 
  sandstone 
  alternating 
  

   with 
  shales. 
  Small 
  quarries 
  have 
  been 
  opened 
  in 
  some 
  of 
  these 
  

   ledges, 
  the 
  stone 
  splitting 
  into 
  six 
  inch 
  layers. 
  Toward 
  the 
  top 
  

   of 
  the 
  hill 
  is 
  the 
  extensive 
  nagging 
  stone 
  quarry 
  known 
  as 
  the 
  

   Alexander 
  or 
  Agrippa. 
  The 
  lower 
  part 
  of 
  it 
  (C 
  4 
  ) 
  consists 
  of 
  12 
  

   feet 
  of 
  bluish 
  gray 
  sandstone 
  which 
  is 
  worked 
  for 
  flagging, 
  sills 
  

   and 
  curbing. 
  Near 
  the 
  middle 
  is 
  a 
  layer 
  unfit 
  for 
  use, 
  1 
  foot, 
  

   4 
  inches 
  thick 
  which 
  splits 
  unevenly 
  and 
  is 
  called 
  " 
  callous 
  " 
  

   by 
  the 
  quarrymen. 
  Again 
  at 
  the 
  top 
  of 
  the 
  even 
  bedded 
  sand- 
  

   stone 
  are 
  three 
  feet 
  of 
  blue 
  sandstone 
  which 
  is 
  not 
  used. 
  The 
  

   dip 
  of 
  the 
  sandstone 
  layers 
  varies 
  from 
  1° 
  to 
  If 
  ° 
  to 
  the 
  southwest. 
  

   Forming 
  the 
  upper 
  part 
  of 
  the 
  wall 
  of 
  the 
  quarry 
  are 
  eight 
  feet 
  

   of 
  bluish, 
  argillaceous 
  shales 
  (C 
  5 
  ) 
  wirich 
  weather 
  to 
  an 
  iron 
  color 
  

   and 
  contain 
  an 
  abundant 
  Hamilton 
  fauna, 
  specially 
  Lamelli- 
  

   branchs. 
  The 
  following 
  species 
  were 
  collected 
  in 
  these 
  shales: 
  

  

  1 
  Spirifer 
  aiidaculus 
  (Con.) 
  Whitfield 
  (a) 
  

  

  2 
  S. 
  mucronatus 
  (Con.) 
  Bill. 
  (r) 
  

  

  3 
  #. 
  granulosus 
  (Con.) 
  H. 
  & 
  C. 
  (rr) 
  

  

  4 
  Productella 
  dumosa 
  Hall 
  (c) 
  

  

  5 
  Tropidoleptus 
  carinatus 
  (Con.) 
  Hall 
  • 
  (a) 
  

  

  6 
  Dignomia. 
  alveata 
  Hall 
  (rr) 
  

  

  7 
  Camarotoechia 
  congregata 
  (Con.) 
  H. 
  & 
  C. 
  . 
  (r) 
  

  

  8 
  G. 
  sappho 
  (Hall) 
  H. 
  & 
  C. 
  (rr) 
  

  

  9 
  Glyptodesma 
  erectum 
  (Con.) 
  Hall 
  (c) 
  

  

  10 
  Grammysia 
  circularis 
  Hall 
  (c) 
  

  

  11 
  G. 
  bisulcata 
  (Con.) 
  Hall 
  (r) 
  

  

  12 
  Tellinopsis 
  sabemarginata 
  (Con.) 
  Hall 
  (r) 
  

  

  13 
  Liorhynchus 
  multicosta 
  Hall 
  (rr) 
  

  

  14 
  Modiomorpha 
  concentrica 
  (Con.) 
  Hall 
  (r) 
  

  

  15 
  Goniophora 
  hamiltonensis 
  (Hall) 
  Miller 
  (c) 
  

  

  16 
  Nyassa 
  argwta 
  Hall 
  Yc) 
  

  

  17 
  Macrodon 
  hamiltoniae 
  Hall 
  (rr) 
  

  

  18 
  Modiomorpha 
  subalata 
  (Con.) 
  Hall 
  ' 
  (rr) 
  

  

  19 
  Nucula 
  corbuliformis 
  Hall 
  (r) 
  

  

  20 
  Nuciilites 
  triqueter 
  Con. 
  (rr) 
  

  

  